Step by Step solution about How to resolve the algorithm Break OO privacy step by step in the Java programming language

Java Source Code Explanation

Explanation:

1. Custom Class (Example):

   • Defines a class named Example with two string fields: stringA (public) and stringB (private).

2. Getting a Declared Field:

   • Creates an instance of the Example class (example).
   • Uses reflection to get the declared field named "stringB" using example.getClass().getDeclaredField("stringB").
   • Sets the setAccessible flag to true to access the private field.
   • Gets the value of stringB using field.get(example) and stores it in the stringB variable.

3. Printing the Values:

   • Prints the values of stringA and stringB obtained through reflection.

Modified Code:

Explanation:

• Same as the original code, but additionally prints the value of stringA, which is accessed directly since it's a public field.

Another Modified Code:

Explanation:

1. Custom Class with Private Method (Example):

   • Defines a modified Example class with a private method named stringB() instead of a string field.

2. Getting a Declared Method:

   • Uses reflection to get the declared method named "stringB" using example.getClass().getDeclaredMethod("stringB").
   • Sets the setAccessible flag to true to access the private method.
   • Invokes the stringB method using method.invoke(example) and stores the result in the stringB variable.

3. Printing the Values:

   • Prints the values of stringA (public field accessed directly) and stringB (private method invoked through reflection).

class Example {
    String stringA = "rosetta";
    private String stringB = "code";
}


Example example = new Example();
Field field = example.getClass().getDeclaredField("stringB");


field.setAccessible(true);


String stringB = (String) field.get(example);


Example example = new Example();
Field field = example.getClass().getDeclaredField("stringB");
field.setAccessible(true);
String stringA = example.stringA;
String stringB = (String) field.get(example);
System.out.println(stringA + " " + stringB);


class Example {
    String stringA = "rosetta";

    private String stringB() {
        return "code";
    }
}


Example example = new Example();
Method method = example.getClass().getDeclaredMethod("stringB");
method.setAccessible(true);
String stringA = example.stringA;
String stringB = (String) method.invoke(example);
System.out.println(stringA + " " + stringB);